Orchidaceae vs genus Maxillaria

Orchidaceae and genus Maxillaria both are nouns.

Word	Noun	Adjective	Verb	Adverb
Orchidaceae	Yes	No	No	No
genus Maxillaria	Yes	No	No	No

Orchidaceae (noun)	genus Maxillaria (noun)
enormous cosmopolitan family of perennial terrestrial or epiphytic plants with fleshy tubers or rootstocks and unusual flowers	large genus of tropical American epiphytic orchids with persistent leathery leaves and single-flowered scapes